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Karyopharm Announces Full Exercise of Underwriters Option to Purchase Additional Shares in Public Offering of Common Stock

NATICK, Mass., June 30, 2014 (GLOBE NEWSWIRE) -- Karyopharm Therapeutics Inc. (Nasdaq:KPTI) today announced that the underwriters of its previously announced public offering of common stock have exercised their option to purchase an additional 397,087 shares of its common stock at a price of $42.50 per share before underwriting discounts. On June 26, 2014, Karyopharm announced the pricing of its underwritten public offering of 2,647,247 shares of its common stock at a price of $42.50 per share before underwriting discounts, of which Karyopharm sold 2,447,247 shares of its common stock, and certain existing stockholders sold 200,000 shares of common stock. The closing of the offering, including the option exercise, is expected on or about July 2, 2014, subject to customary closing conditions.

Gross proceeds to Karyopharm, before sale of the additional shares subject to the option will be approximately $97.8 million, and will be approximately $120.9 million after giving effect to the option exercise. Karyopharm will not receive any proceeds from the sale of shares by the selling stockholders.

BofA Merrill Lynch and Leerink Partners LLC are acting as joint book running managers for the offering. JMP Securities LLC, Wedbush PacGrow Life Sciences and Oppenheimer & Co. are acting as co-managers.

A registration statement relating to this offering was declared effective by the U.S. Securities and Exchange Commission on June 26, 2014. The offering is being made only by means of a prospectus, copies of which may be obtained from BofA Merrill Lynch, 222 Broadway, New York, NY 10038, Attn: Prospectus Department, or via email, at dg.prospectus_requests@baml.com, or from Leerink Partners LLC, Attention: Syndicate Department, One Federal Street, 37th Floor, Boston, MA, 02110, or by phone at 1-800-808-7525, ext. 4814, or by email at Syndicate@leerink.com.

This press release does not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Karyopharm

Karyopharm Therapeutics Inc. (Nasdaq:KPTI) is a clinical-stage pharmaceutical company focused on the discovery and development of novel first-in-class drugs directed against nuclear transport targets for the treatment of cancer and other major diseases.

Forward-Looking Statements

Any statements in this press release about future expectations, plans and prospects for Karyopharm Therapeutics Inc., including statements about Karyopharm's public offering, future expectations, plans and prospects for the company and other statements containing the words "anticipate," "believe," "estimate," "expect," "intend," "may," "plan," "predict," "project," "target," "potential," "will," "would," "could," "should," "continue," and similar expressions, constitute forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. Actual results may differ materially from those indicated by such forward-looking statements as a result of various important factors, including: the uncertainties related to market conditions and the completion of the public offering on the anticipated terms or at all, uncertainties inherent in the initiation of future clinical trials, expectations of expanding ongoing clinical trials and other factors discussed in the "Risk Factors" section of Karyopharm's Annual Report on Form 10-K for the year ended December 31, 2013, which is on file with the Securities and Exchange Commission (SEC), the "Risk Factors" section of Karyopharm's Registration Statement on Form S-1 related to this public offering, and in other filings that Karyopharm may make with the SEC in the future. Any forward-looking statements contained in this press release speak only as of the date hereof, and, except as may be required by applicable law, Karyopharm expressly disclaims any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise.

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